First of, your wife has a nice little collection of VARIOUS smellies and you are being a gentleman! All of them are classics in the making, I would say, and most of them are beautiful elegant florals .
In Love Again is one of my favorites, I have the one with the golden lid and the one with the multi-clolored lid, and I like the combo of black currant and grapefruit and tomato leaf. I have never tried the newest release though (Fleuer de la Passion), and the rumor is that YSL is planning to release a limited edition of In Love Again every summer. Something like Escada seasonal fragrances, I guess. :-)
The smell of the original In Love Again fragrance circa 1998 is the epythomy of spring captured in a bottle, and I have worn it extensively during the months of May and June. The beginning might strike you as a little sharp, but give it some time, In Love Again developes into the most feminine, playful and luscious fragrance. And, of course, it must be sniffed to be delivered....
Here is what you need to do: take your wife with you on your next trip to the fragrance store, and let HER decide. You can either go the road of classics with florals (that you know now she likes): Arpege, Shalimar, Joy, Chanel #5, Estee, White Linen, Chaumet, Poeme Lancome, Flower Kenzo, J'Adore, Shi Alfred Sung (and that's what I would do in your shoes), or introduce her to other fragrance families, like chypres (start with Truth, # 19, Cristalle, Ivoire, Diva) or citrus perfumes, or, even better for coming fall, go exclusively for heavier orientals, but this is the riskier road. Who knows, may be the new SJP Lovely will be the one SHE choses!
Well, on another note, Basic Instinct is not what I want to write in my SOTD thread, but it might be just me!!! ;-)